A pre-2000 Focus with a 1.4 Zetec SE lump has suspected damage to either bottom end bearings or main bearings (not sure which). Symptom is a slight rattling when revved, doesn't seem to be top end but there is no smoke or oil loss either.

Anyway, after a brief google it seems that the 1.4's are notoriously weaker than others, but I've also heard it thrown around that parts of the block assembly are not rebuildable in these engines. Something to do with the main bearings not having dowels. Could anyone elaborate on this?

Thanks in advance